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Eliminate cases where we could << by 64, which is undefined in C.

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llvm-svn: 21500
This commit is contained in:
Chris Lattner 2005-04-24 17:46:05 +00:00
parent e33c68918a
commit e78ae0e1b1
1 changed files with 5 additions and 9 deletions
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14
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -691,7 +691,7 @@ Instruction *InstCombiner::visitAdd(BinaryOperator &I) {
// Form a mask of all bits from the lowest bit added through the top.
uint64_t AddRHSHighBits = ~((AddRHSV & -AddRHSV)-1);
AddRHSHighBits &= (1ULL << C2->getType()->getPrimitiveSizeInBits())-1;
AddRHSHighBits &= ~0ULL >> (64-C2->getType()->getPrimitiveSizeInBits());
// See if the and mask includes all of these bits.
uint64_t AddRHSHighBitsAnd = AddRHSHighBits & C2->getRawValue();
@ -718,7 +718,7 @@ Instruction *InstCombiner::visitAdd(BinaryOperator &I) {
// highest order bit set.
static bool isSignBit(ConstantInt *CI) {
unsigned NumBits = CI->getType()->getPrimitiveSizeInBits();
return (CI->getRawValue() & ~(-1LL << NumBits)) == (1ULL << (NumBits-1));
return (CI->getRawValue() & (~0ULL >> (64-NumBits))) == (1ULL << (NumBits-1));
}
/// RemoveNoopCast - Strip off nonconverting casts from the value.
@ -1427,7 +1427,7 @@ Instruction *InstCombiner::OptAndOp(Instruction *Op,
uint64_t AndRHSV = cast<ConstantInt>(AndRHS)->getRawValue();
// Clear bits that are not part of the constant.
AndRHSV &= (1ULL << AndRHS->getType()->getPrimitiveSizeInBits())-1;
AndRHSV &= ~0ULL >> (64-AndRHS->getType()->getPrimitiveSizeInBits());
// If there is only one bit set...
if (isOneBitSet(cast<ConstantInt>(AndRHS))) {
@ -2582,8 +2582,7 @@ Instruction *InstCombiner::visitSetCondInst(SetCondInst &I) {
Constant *Mask;
if (CI->getType()->isUnsigned()) {
unsigned TypeBits = CI->getType()->getPrimitiveSizeInBits();
if (TypeBits != 64)
Val &= (1ULL << TypeBits)-1;
Val &= ~0ULL >> (64-TypeBits);
Mask = ConstantUInt::get(CI->getType(), Val);
} else {
Mask = ConstantSInt::get(CI->getType(), Val);
@ -2985,9 +2984,6 @@ Instruction *InstCombiner::visitSetCondInstWithCastAndCast(SetCondInst &SCI) {
if (SCI.getOpcode() == Instruction::SetNE)
return ReplaceInstUsesWith(SCI, ConstantBool::True);
// SignBitSet - True if the top bit of the compared constant value is set.
bool SignBitSet = CI->getRawValue() & 1ULL << (DestBits-1);
// Evaluate the comparison for LT.
Value *Result;
if (DestTy->isSigned()) {
@ -3405,7 +3401,7 @@ Instruction *InstCombiner::visitCastInst(CastInst &CI) {
CI.getType()->getPrimitiveSizeInBits()) {
assert(CSrc->getType() != Type::ULongTy &&
"Cannot have type bigger than ulong!");
uint64_t AndValue = (1ULL << CSrc->getType()->getPrimitiveSizeInBits())-1;
uint64_t AndValue = ~0ULL>>(64-CSrc->getType()->getPrimitiveSizeInBits());
Constant *AndOp = ConstantUInt::get(A->getType()->getUnsignedVersion(),
AndValue);
AndOp = ConstantExpr::getCast(AndOp, A->getType());